#33 Arsenic

Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid. It has various allotropes, but only the gray form, which has a metallic appearance, is important to industry.

Atomic mass:74.9216 amu

Melting point:817.0 C (1090.15 K, 1502.6 F)

Boiling point:613.0 C (886.15 K, 1135.4 F)

Density:293 K: 5.72 g/cm3